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Vulnerability Details :

CVE-2026-8964

Summary
Assigner-mozilla
Assigner Org ID-f16b083a-5664-49f3-a51e-8d479e5ed7fe
Published At-19 May, 2026 | 12:30
Updated At-19 May, 2026 | 17:10
Rejected At-
Credits

Spoofing issue in the Popup Blocker component

Spoofing issue in the Popup Blocker component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
▼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:mozilla
Assigner Org ID:f16b083a-5664-49f3-a51e-8d479e5ed7fe
Published At:19 May, 2026 | 12:30
Updated At:19 May, 2026 | 17:10
Rejected At:
▼CVE Numbering Authority (CNA)
Spoofing issue in the Popup Blocker component

Spoofing issue in the Popup Blocker component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.

Affected Products
Vendor
Mozilla CorporationMozilla
Product
Firefox
Versions
Unaffected
  • From 151 through * (rpm)
Vendor
Mozilla CorporationMozilla
Product
Thunderbird
Versions
Unaffected
  • From 151 through * (rpm)
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Satoki Tsuji
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://bugzilla.mozilla.org/show_bug.cgi?id=2025170
N/A
https://www.mozilla.org/security/advisories/mfsa2026-46/
N/A
https://www.mozilla.org/security/advisories/mfsa2026-50/
N/A
Hyperlink: https://bugzilla.mozilla.org/show_bug.cgi?id=2025170
Resource: N/A
Hyperlink: https://www.mozilla.org/security/advisories/mfsa2026-46/
Resource: N/A
Hyperlink: https://www.mozilla.org/security/advisories/mfsa2026-50/
Resource: N/A
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Problem Types
TypeCWE IDDescription
CWECWE-451CWE-451 User Interface (UI) Misrepresentation of Critical Information
Type: CWE
CWE ID: CWE-451
Description: CWE-451 User Interface (UI) Misrepresentation of Critical Information
Metrics
VersionBase scoreBase severityVector
3.17.5HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Version: 3.1
Base score: 7.5
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:security@mozilla.org
Published At:19 May, 2026 | 14:16
Updated At:19 May, 2026 | 18:16

Spoofing issue in the Popup Blocker component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary3.17.5HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Type: Secondary
Version: 3.1
Base score: 7.5
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CPE Matches
Weaknesses
CWE IDTypeSource
CWE-451Secondary134c704f-9b21-4f2e-91b3-4a467353bcc0
CWE ID: CWE-451
Type: Secondary
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://bugzilla.mozilla.org/show_bug.cgi?id=2025170security@mozilla.org
N/A
https://www.mozilla.org/security/advisories/mfsa2026-46/security@mozilla.org
N/A
https://www.mozilla.org/security/advisories/mfsa2026-50/security@mozilla.org
N/A
Hyperlink: https://bugzilla.mozilla.org/show_bug.cgi?id=2025170
Source: security@mozilla.org
Resource: N/A
Hyperlink: https://www.mozilla.org/security/advisories/mfsa2026-46/
Source: security@mozilla.org
Resource: N/A
Hyperlink: https://www.mozilla.org/security/advisories/mfsa2026-50/
Source: security@mozilla.org
Resource: N/A

Change History

0
Information is not available yet

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